Silicone Resin Film, Method Of Preparing Same, And Nanomaterial-Filled Silicone Composition
a silicone resin and nanomaterial technology, applied in the direction of coatings, nanotechnology, liquid surface applicators, etc., can solve the problems of limited utility of free standing silicone resin films, and achieve the effects of high thermal stability, flexibility, and mechanical strength
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example 1
[0092]This example demonstrates the preparation of a chemically oxidized carbon nanofiber. Pyrograf®-III carbon nanofiber (2.0 g), 12.5 mL of concentrated nitric acid, and 37.5 mL of concentrated sulfuric acid were combined sequentially in a 500-mL three-neck flask equipped with a condenser, thermometer, Teflon-coated magnetic stirring bar, and a temperature controller. The mixture was heated to 80° C. and kept at this temperature for 3 h. The mixture was then cooled by placing the flask on a layer of dry ice in a one gallon pail. The mixture was poured into a Buchner funnel containing a nylon membrane (0.8 μm) and the carbon nanofibers were collected by vacuum filtration. The nanofibers remaining on the membrane were washed several times with deionized water until the pH of the filtrate was equal to the pH of the wash water. After the last wash, the carbon nanofibers were kept in the funnel for an additional 15 min. with continued application of the vacuum. Then the nanofibers, sup...
example 2
[0093]This example demonstrates the preparation of the silicone resin used in Example 3. Trimethoxyphenylsilane (200 g), tetramethyldivinyldisiloxane (38.7 g), deionized water (65.5 g), toluene (256 g), and trifluoromethanesulfonic acid (1.7 g) were combined in a 3-neck, round-bottom flask equipped with a Dean-Stark Trap and thermometer. The mixture was heated at 60 to 65° C. for 2 hours. The mixture was then heated to reflux and water and methanol were removed using a Dean-Stark trap. When the temperature of the mixture reached 80° C. and the removal of water and methanol was complete, the mixture was cooled to less than 50° C. Calcium carbonate (3.3 g) and water (about 1 g) were added to the mixture. The mixture was stirred at room temperature for 2 hours and then potassium hydroxide (0.17 g) was added to the mixture. The mixture was then heated to reflux and water was removed using a Dean-Stark trap. When the reaction temperature reached 120° C. and the removal of water was compl...
example 3
[0095]The oxidized carbon nanofiber of Example 1 (0.05 g) was mixed with 20.00 g of the silicone resin solution of Example 2 in a glass vial. The vial was placed in an ultrasonic bath for 210 min. The mixture was then subjected to centrifugation at 1500 rpm for 30 min. The supernatant was transferred to a clean vial.
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